Drilling-machine.



No. 707.507. Patented Aug. I9, 1902.

F. N. GARDNER.

DRILLING MACHINE.

(Application filed Nov. 8, 1901.)

(No Model.) 5 Sheets-Sheet l.

m: mums PETERS co. whom-1.16m mswmmon, p. c

No. 707,507. Patented Aug. l9, I902. F. mmxnunsn.

DRIL'LING MACHINE.

(Application filed Nov. 8, 1901.) (No Model.) 5 Sheets-Sheet 3.

No. 707,507. Patented Au I9, I902! F. n. GARDNER.

DRILLING MACHINE.

(Application filed Nov. 8, 19011 (No Model.) 5 Sheets-$heat 4.

No. 707,507. Patented Aug. 19, 1902.

F. N. GARDNER.

DRILLING MACHINE.

Application filed Nov. 8, 1901.) (No Model.) 5 Shaets-Sheet 5.

ATENT OFFICE.

FREDERICK N. GARDNER, OF BELOIT, WISCONSIN.

DRILLING- MACHINE.

SPEGIFICATION forming part Of Letters Patent No. 707,507, dated August 19, 1902.

Application filed November 8,1901. Serial No. 81,566. (No model.)

To ctZZ whom it may concern:

Be it known that I FREDERICK N. GARD- NER, of Beloit, in the county of Rock and State of Wisconsin, have invented certain new and useful Improvements in Drilling-Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, ref erence being had to the accompanying drawiugs, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in multiple drilling-machines of that class embracing a plurality of drill-spindles which are driven from a centrally-located shaft and a plurality of work-tables, one for each drillspindle, which are movable toward and from the drills to feed the work thereto, said worktables being so constructed that they are automatically advanced toward and retracted from the drills during the drilling operation.

The invention consists in the matters hereinafter set forth, and more particularly pointed out in the appended claims.

In the drawings, Figure 1 is a side elevation of a drilling-machine embodying my invention. Fig. 2 is a central vertical section thereof. Fig. 3 is a plan section on line 3 3 of Fig. 2. Figs. 4 and 5 are two views from opposite sides of the cam-ring onwhich are formed the cam-shoulder for advancing the work-tables to the drill. Fig. 6 is a fragmentary detail illustrating a section of the work-table support, showing one of the tables and its stem and showing also the table-actuating cam-rin g and the connections between the same and said table-stem. Fig. 7 is a side view of the part shown in Fig. 6. Fig. 8 is a transverse section on line 8 8 of Fig. 6. Fig. 9 is a transverse section on line 9 9 of Fig. 6. Fig. 10 is a top plan view of the upper part of the machine. Fig. 11 is a horizontal transverse sec tion on line 11 11 of Fig. 1.

As shown in the drawings, A designates a horizontal bed-plate or table, which is supported on vertical standards A A',rising from a base-plate A, and A designates a hollow column or pedestal rising upwardly from said table.

B designates a vertical shaft, which is contained within said hollow column and has bearing in short bearing sleeves or bushings B B at the upper and lower ends of the columns. Said shaft projects at its lower end through and beneath the bed-plate A and is provided at its lower end with a horizontal beveled gear-wheel B which meshes with a gear-pinion G, by which said gear-wheel and shaft B are rotated. Said pinion O is affixed to a horizontal shaft 0, which is mounted at one end in one of the standards A of the bedplate and at its other end in an upright standard A rising from said plate. Said shaft is provided with a set of conical pulleys C by which power is transmitted to drive the shaft B. t

D designates a sleeve which surrounds or incloses the tubular column A throughout the principal part of its length. Said sleeve rests on an annular horizontal bearing-shoulder a on the bed-plate A, said shoulder a receivin g the vertical thrust of said sleeve and parts supported thereby. Said sleeve D supports near its upper end a drill-spindle sup port E and below said drill-spindle support a work-table support F. Said drill-spindle support E is non-rotatively fixed to the upper end of the sleeve D and rests on an upwardly-facing shoulder d on said sleeve. The work-table support is also affixed non-rotatively to said sleeve below said spindle-support and rests on a like exterior upwardly-facingshoulder d. Said spindle-support is provided at its margin with a plurality of annularlydisposed vertical bearing-sleeves E, whose axes are parallel with the central axis of said support and concentric with the axis of the column A Rotatively mounted in said bearings are vertical spindles E, having chucks e at their lower ends to receive the usual twist-drills e. Affixed to the upper ends of said drill-spindles are a plurality of gear-pinions E which are adapted to mesh with a central gear-wheel B non-rotatively affixed'to the upper end of the shaft B above the upper end of the column A Said gearpinions are heldin place on the spindles by means of nuts e which have screw-threaded engagement with the upper ends of the spindles, and the gear-wheel B is similarly affixed to the shaft B by means of a nut b, which has screw-threaded engagement with the upper end of said shaft and engages the hub of said gear-wheel. A designates a bearing ring which surrounds the reduced part of the upper end of the column'A and is located between the gear-wheel B at one side thereof and the column A sleeve D, and spindlesupport E at the other side.

The work-table support is made generally similar to the spindle-support and is provided near its margin with a plurality of sleeves or tubular bearings F, Whose axes are parallel with the central axis of said support. Said sleeves are located severally vertically beneath the spindles E. Located within said bearings F are stems G, which carry at their upper ends horizontal work-tables G, upon which the work is held while being drilled, said tables being circular and provided with undercut grooves to receive the usual jigs by which the work is fastened to the table. Said stems G are endwise movable but non-rotative in their bearings F, whereby the said tables may be moved toward and from the drills during the drilling operation. For this purpose the stems are herein shown as provided with longitudinal grooves g, Figs. 6 and 8, which are engaged by stationary keys or feathers F attached to the table-support and projecting radially inwardly into the bearings toward said stems. Said keys, as herein shown, are located in vertical slots in the outer sides of the bearings F and are held in place by means of screw-bolts f, passing transversely through said bearings at one side of the bore thereof and through the keys. The bolts f being inserted through the parts of the bearings at opposite sides of the slot serve to tighten the sides of the slots against the keys. and thus firmly clamp the same in place. The keys, moreover, may be removed outwardly from the slots when the bolts are removed, so that the removal and insertion of the said keys are greatly facilitated. The work-table and spindle-supports by reason of the attachment thereof with the rotative bearing-sleeve B are maintained in the same relative positions, and said tables are automatically raised toward the drills during the drilling operation by the action of a cam. The specific mechanism for this purpose is made as follows:

H designates a stationary ring which surrounds the lower end of the sleeve D and is located beneath the work-table support F. Said ring is supported on standards H, which are aflixed to the bed-plate A by screw-bolts h in the manner as shown in Figs. 2'and 3. Said ring is provided on its outer surface with a curved strip H forming part of a cam-shoulder, which is adapted to be engaged by bearing-rollers g, projecting inwardly from collars G which surround the lower endsof the work-table stems. Said curved strip H consists of a continuous strip having at its entering end a short upwardly-inclined part it, which rises from a horizontal annular shoulder h at the base of said ring H. Said short inclined portion h of the camstrip intersects the gradually-rising part 7L3 of said cam, which extends a suitable distance around the ring and rises gradually from one end' thereof to the other. Said gradually-rising part 72 of the cam-strip intersects a short horizontal part 71 constitut ing the highest portion of the cam, which latter intersects a sharply-declining part 7 which joins with the lowest part of the cam, formed by the portion of the shoulder 72 located between the ascending and descending portions of the cam-strip. h designates a short downwardly-inclined strip which is parallel with the part 77, of the cam-strip, between which strip h and the part h of the cam-strip is formed a groove which guides the bearing-rollers as they leave the highest part of the cam. The said sleeve D is given rotation, and the bearing-rollers of the worktable stems are carried over the cam-shoulder, formed, as described, to automatically advance and retract the tables by the following mechanism.

I designates a worm-gear ring which fits in an annular rabbet at the lower end of the sleeve, said ring being attached by screws or bolts 2' to an annular flange (1 formed above the rabbet in said sleeve D.

I designates a worm-shaft mounted in bearings I I on the base-plate A, and the worm I of which engages the worm-gear I. Rotation of the sleeve D causes the spindle and Work-table supports to revolve, and said revolution carries the lower ends of the stems of the work-tables around the cam-ring H, with the bearing-rollers of said stems traveling over the cam-shoulder thereof. Said tables are therefore gradually raised toward the spindles as the support rotates until the rollers come into contact with the horizontal bearing-surface of said cam, at which time the tables travel a short distance horizontally, their advance toward the drill-spindles being arrested. After passing said horizontal part of the cam the bearing-rollers come into contact with the descending part of the cam, which causes the work-tables to be retracted from the spindles.

In the use of the drilling-machine the worktable support and spindle-support are revolved at a comparatively slow speed, the actualspeed depending upon the character of the work. The work is fastened to each table when the table is occupying its lowermost position or when the bearing-wheel thereof rests on the part of the cam-shoulder formed on the shoulder h of the cam-ring, and as the tables gradually rise or are advanced toward the drilling-spindles the drilling of the work is effected. The work re mains on the table until the table is again retracted, at which time the finished work is removed and a new piece of work fastened in place on the table.

The collars G are capable of movement vertically on the work-table stems in order to adjust said tables to varying thicknesses of work. For this purpose said collars are split IIO and provided on the opposite sides of the split portions thereof with overlapping lugs 9 through which pass screw-threaded bolts which when tightened clamp the collars on the stems and when loosened permit said collars to slide on the stems. The collars G are affixed non-rotatively on the worktable stems by means of short keys g, which are set into grooves in the inner faces of the sleeves and project laterally into the grooves g of said stems. The keys are fastened to the collars G2 by means of screw-bolts which pass through the collars and into the keys in the manner shown in Fig. 6. Stops are provided for limiting the vertical adjustmentof the collars G which consist in this instance of two set-screws g which are seated in screw-threaded apertures in the bottom of the grooves of the stems above and below the collars G and project outwardly into the paths of the keys of said sleeves. The purpose of said stops is, first, to prevent said collars being raised sufficiently in adjusting the same as to permit said collars to strike the under side of the worktable support when the tables are in their uppermost positionsin the operation of the machine, and, secondly, to prevent the tables being suiticiently depressed to permit said tables coming in contact with the upper surface of the work-table support when the tables are in their lowermost positions.

The structural details may be varied somewhat from that herein shown without departing from the spirit of the invention, and I do not wish to be limited to such details except as hereinafter made the subject of specific claims.

I claim as my invention 1. The combination with a vertical column, of a revolving work-table support, annularly arranged, rotative drill-spindles which revolve with said work-table support, work-tables located severally beneath said drill-spindles and provided with stems which have sliding, non-rotat-ive engagement with said worktable support, a concentric stationary camring below said work-table support provided on its cylindric surface with an upwardly-facing cam-shoulder, laterally-directed bearingrollers on the lower ends of said stems which have bearing on said cam-shoulder,and means for vertically adjusting said bearing-rollers on said stems.

2. The combination with a vertical column, of a revolving work-table support, annularly arranged, rotative drill-spindles which revolve with the work-table support, work-tables located severally beneath said drill-spindles and provided with stems which have sliding, non-rotative engagement with said worktable support, a stationary concentric camring below said work-table support and provided on its cylindric surface with an upwardly facing cam-shoulder, laterally directed bearing-rollers on the lower ends of said stems which have bearing on said camshoulder, means for vertically adjusting said bearing-rollers on said stems, and means on said stems for limiting the vertical adjustment of the bearing-rollers thereon.

The combination with a vertical column, of a revolving work-table support, annularly arranged, rotative drillspindles revolving with said work-table support, work-tables located severally beneath said drill-spindles and provided with stems which have sliding, non-rotative engagement with said work-table support, a concentric, stationary camring below said work-table support provided on its cylindric surface with an upwardlyfacing cam shoulder, collars surrounding the lower ends of said stems, laterally-directed bearing-rollers on said collars adapted for engagement with said cam shoulder, said collars being provided with inwardlyprojecting parts adapted to enter longitudinal grooves in said stems, and being capable of longitudinal movement with respect to the stems to permit vertical adjustment of the collars.

t. The combination with a vertical column, of a revolving work-table support, annularly arranged, rotative drill-spindles revolving with said work.- table support, work-tables located severally beneath said drill-spindles and provided with stems which have sliding, non-rotative engagement with said worktable support, a concentric, stationary camring below said work-table support and provided on its cylindric surface with an upwardly-faci n g cam-shoulder, collars surrounding the lower ends of said stems, laterallydirected bearing-rollers on said collars adapted for engagement with said cam-shoulder, said collars being provided with inwardlyprojecting parts adapted to enter longitudinal grooves in said stems andv being capable of longitudinal movement on the stems to permit vertical adjustment of the collars, and stops in said grooves adapted for engagement with the projecting parts of the collars to limit the vertical adjustment of the collars on said stems.

In testimony that I claim the foregoing as my invention I affix my signature, in presence of two witnesses, this 2d day of November, A. D. 1901.

FREDERICK N. GARDNER.

NVitnesses:

Jon B. Dow, J. S. Dow. 

